Dead pixel, UDPIxel work?

So I downloaded UDPixel in hopes to solve my dead pixel problem, have a few clusters on the left edge of my ASUS 27"

but I don't know how to use this program it says click start and move the flashing box to the locatin, i see NO flashing box. it only runs tests per each color when I click them. I set to 5x5 anc click start and I see no flashing box square on any of my monitors